Nick +1
I own a custom built non-lockup 700R4.
Read my sig slogan, at the bottom of my post carefully...
Removing the electronics and installing a non-lockup Transgo kit, IS NOT THE SAME as unplugging the connector and running without a lockup, on a locking converter.
You also remove the brake switch, which "unlocks" and switches the entire system using solenoids, under load, via the ECM. So the solenoids, MUST be dealt with, or a furnace ensues. The ECM is expecting lockup and everything in the chip is programmed to see a lockup.
Turbo4whl posted a terrific diagram, why "everything matters, all the time".
Cutting off the blood flow to your overdrive planetary set, doesn't sound like such a good idea. The pressure bleeds off to exactly the correct pressure for all your seals and valves, while thrusting a burst of cooled liquid, adding velocity to the gear inertia.
The diagram is amazing, showing how complicated every turn gets and how many circuits it crosses.
The only way to cut out the ECM, the solenoids, the lockup and the connector, is to build the internals, so they are no longer needed, entirely. I had one built, and I'm no expert.
Unless you have studied the hydraulic colored circuit diagrams and electronics failure modes, extensively, you cannot presume to know anything. The torque converter runs very hot when not locked up in 4th, if it is designed to lockup. It is a system, you cannot just cut stuff off without consequences.
Be careful of those on forums such as these who regurgitate what they read on another forum, as fact. Ask for a second opinion. There are a lot of hack mods out there.
Call Art Carr and ask him what running a lock up 700R4 converter, without implementing the lockup circuit, on an unmodified valve with solenoids does, and get back to us with his answer. He's probably built ten's of thousands of them, by now.
The original non lockup is called the 200-4R. Good Guy's race them every weekend and they win races, every weekend.
https://cpttransmission.com/
Sometimes... the "IGNORE" button, located under each and every one of our user ID's, on the left side of the screen, is your friend.
Nick, an expert builder, with amazing youtube instructional videos, (watched by tens of thousands of tuber user's), is blocking this guy... using the IGNORE button...
Why is this significant to your transmission question and who
should you trust not to fry your rig?